Apple's displays up to 720p with an HDMI connector (get a cheap DVI adapter or DVI to HDMI cable if you need it), has a dock connector pass-thru port to simultaneously charge, and is $20 cheaper than the knock-off you posted.

i'm very curious as to what features this DVI adapter you linked to provides that Apple's adapter doesnt have.

MacRumors attracts a broad audience
of both consumers and professionals interested in
the latest technologies and products. We also boast an active community focused on
purchasing decisions and technical aspects of the iPhone, iPod, iPad, and Mac platforms.